Add Gitea act runner bootstrap tooling

scripts/dev-vm/install-act-runner-systemd.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+# Install systemd unit for Gitea act_runner on the Gitea host (e.g. dev-vm 5700).
+# Run inside the container, or: ssh root@<proxmox> "pct exec 5700 -- bash -s" < scripts/dev-vm/install-act-runner-systemd.sh
+#
+# Optional env:
+#   WORK_DIR       default /opt/act_runner
+#   GITEA_ACTION_URL  default http://127.0.0.1:3000 (same host as Gitea)
+
+set -euo pipefail
+
+WORK_DIR="${WORK_DIR:-/opt/act_runner}"
+GITEA_ACTION_URL="${GITEA_ACTION_URL:-http://127.0.0.1:3000}"
+
+if [ ! -x "${WORK_DIR}/act_runner" ]; then
+  echo "Missing ${WORK_DIR}/act_runner — run setup-act-runner.sh with GITEA_RUNNER_REGISTRATION_TOKEN first."
+  exit 1
+fi
+
+if [ ! -f "${WORK_DIR}/.runner" ]; then
+  echo "Missing ${WORK_DIR}/.runner — register first: GITEA_RUNNER_REGISTRATION_TOKEN=... bash setup-act-runner.sh"
+  exit 1
+fi
+
+cat > /etc/systemd/system/act-runner.service << EOF
+[Unit]
+Description=Gitea act_runner
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=${WORK_DIR}
+ExecStart=${WORK_DIR}/act_runner daemon
+Restart=on-failure
+RestartSec=10
+Environment=GITEA_ACTION_URL=${GITEA_ACTION_URL}
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload
+systemctl enable act-runner
+systemctl restart act-runner
+systemctl --no-pager status act-runner